e83d5f939a
Release: crash-8.0.5-2 Resolves: RHEL-43414 Signed-off-by: Tao Liu <ltao@redhat.com>
71 lines
2.5 KiB
Diff
71 lines
2.5 KiB
Diff
From 6752571d8d782d07537a258a1ec8919ebd1308ad Mon Sep 17 00:00:00 2001
|
|
From: Lianbo Jiang <lijiang@redhat.com>
|
|
Date: Wed, 5 Jun 2024 16:28:58 +0800
|
|
Subject: [PATCH 7/9] X86 64: fix for crash session loading failure
|
|
|
|
Kernel commit 223b5e57d0d5 ("mm/execmem, arch: convert remaining
|
|
overrides of module_alloc to execmem") makes crash session loading
|
|
failure as below:
|
|
|
|
# ./crash -s
|
|
crash: seek error: kernel virtual address: ffffffff826bb418 type: "page_offset_base"
|
|
|
|
For X86 64 architecture, currently crash will search for symbol
|
|
"module_load_offset" to determine if the KASLR is enabled, and go
|
|
into the relevant code block. But the symbols "module_load_offset"
|
|
has been removed since Linux v6.10-rc1, which caused the current
|
|
failure.
|
|
|
|
And this issue can occur with live debugging and core dump file
|
|
debugging.
|
|
|
|
Let's check the symbol "kaslr_regions" instead of "module_load_offset"
|
|
to fix it.
|
|
|
|
Signed-off-by: Lianbo Jiang <lijiang@redhat.com>
|
|
---
|
|
symbols.c | 13 ++++++++-----
|
|
1 file changed, 8 insertions(+), 5 deletions(-)
|
|
|
|
diff --git a/symbols.c b/symbols.c
|
|
index 107920f..f3c94b0 100644
|
|
--- a/symbols.c
|
|
+++ b/symbols.c
|
|
@@ -619,9 +619,9 @@ strip_symbol_end(const char *name, char *buf)
|
|
* or in /proc/kallsyms on a live system.
|
|
*
|
|
* Setting KASLR_CHECK will trigger a search for "module_load_offset"
|
|
- * during the initial symbol sort operation, and if found, will
|
|
- * set (RELOC_AUTO|KASLR). On live systems, the search is done
|
|
- * here by checking /proc/kallsyms.
|
|
+ * or "kaslr_regions" during the initial symbol sort operation, and
|
|
+ * if found, will set (RELOC_AUTO|KASLR). On live systems, the search
|
|
+ * is done here by checking /proc/kallsyms.
|
|
*/
|
|
static void
|
|
kaslr_init(void)
|
|
@@ -646,7 +646,8 @@ kaslr_init(void)
|
|
st->_stext_vmlinux = UNINITIALIZED;
|
|
|
|
if (ACTIVE() && /* Linux 3.15 */
|
|
- (symbol_value_from_proc_kallsyms("module_load_offset") != BADVAL)) {
|
|
+ ((symbol_value_from_proc_kallsyms("kaslr_regions") != BADVAL) ||
|
|
+ (symbol_value_from_proc_kallsyms("module_load_offset") != BADVAL))) {
|
|
kt->flags2 |= (RELOC_AUTO|KASLR);
|
|
st->_stext_vmlinux = UNINITIALIZED;
|
|
}
|
|
@@ -14251,7 +14252,9 @@ numeric_forward(const void *P_x, const void *P_y)
|
|
st->_stext_vmlinux = valueof(y);
|
|
}
|
|
if (kt->flags2 & KASLR_CHECK) {
|
|
- if (STREQ(x->name, "module_load_offset") ||
|
|
+ if (STREQ(x->name, "kaslr_regions") ||
|
|
+ STREQ(y->name, "kaslr_regions") ||
|
|
+ STREQ(x->name, "module_load_offset") ||
|
|
STREQ(y->name, "module_load_offset")) {
|
|
kt->flags2 &= ~KASLR_CHECK;
|
|
kt->flags2 |= (RELOC_AUTO|KASLR);
|
|
--
|
|
2.40.1
|
|
|